Скачать или смотреть Troubleshooting MySQL Server Startup Issues on Ubuntu: Control Process Exited with Error Code

Learn how to resolve MySQL server startup issues on Ubuntu, including the common error message `Control process exited with error code`, through quick troubleshooting steps.
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This video is based on the question https://stackoverflow.com/q/62524355/ asked by the user 'joydeba' ( https://stackoverflow.com/u/1797926/ ) and on the answer https://stackoverflow.com/a/63650001/ provided by the user 'Mostafijur Rahaman' ( https://stackoverflow.com/u/14188351/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting MySQL Server Startup Issues on Ubuntu

Are you unable to start your MySQL server and receiving the frustrating message "Control process exited with error code"? You're not alone. Many users encounter this issue, especially after making changes or stopping the service. This guide will guide you through understanding the problem and provide you with a step-by-step solution to get your MySQL server up and running again.

Understanding the Problem

After stopping the MySQL server, attempting to restart it often leads you down a rabbit hole of cryptic error messages. The underlying issue is usually related to file permissions or directory access, which prevents MySQL from launching properly. In this case, your error log may include messages like:

Job for mysql.service failed because the control process exited with error code.

mysqld does not have the access rights to the directory.

Cannot open datafile './ibdata1'.

These errors indicate a permissions issue that needs to be addressed before the server can start.

Steps to Resolve the Issue

Follow these steps to troubleshoot and resolve the issue effectively:

Step 1: Check MySQL Status

First, verify the status of your MySQL service to gather more information about the error. Run the following command:

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This command will show you the active status of your MySQL server. If it’s failed, you'll see exit codes indicating that something went wrong.

Step 2: Review the Error Logs

Next, check the MySQL error logs to identify specific issues preventing the server from starting. You might find messages like 'InnoDB: Cannot open datafile ./ibdata1' which suggests a problem with file access rights.

Step 3: Adjust Permissions

The most common fix for this problem is to correct the file permissions and ownership in the MySQL directory. Use the following commands to do so:

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chmod -R u+ rwx /etc/mysql/ gives read, write, and execute permissions to the user for all files and directories under /etc/mysql.

chown -R mysql:mysql /etc/mysql/ changes the ownership of the MySQL directory to the MySQL user and group, ensuring that the server has proper permissions to access its configuration files and data.

Step 4: Restart MySQL Service

After making these adjustments, try restarting the MySQL service again:

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Step 5: Check Status Again

Finally, verify the status once more with the following command to confirm the MySQL server is now running:

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If everything has been configured correctly, you should see that the service is active and running smoothly.

Conclusion

Running into the Control process exited with error code issue when starting MySQL can be frustrating, but with the correct adjustments, you can resolve it in no time. Always ensure that your MySQL server has the necessary permissions to access its files and directories.

By following the steps outlined above, you should be well on your way to a smoothly functioning MySQL server on your Ubuntu system. Don't hesitate to reach out in the comments if you have any further questions or if more issues arise!